// Adds line numbers to text files, by Kevin Jenkins

#include <stdio.h>
#include <stdlib.h>

#define MAXSTRINGLENGTH 200

void main(int argc, char* argv[])
{
	FILE *input, *output;
	char string[MAXSTRINGLENGTH];
	char lineNumberString[10];
	int lineNumber=1;

	if (argc != 3)
	{
		puts("Usage: cfile1 input_file output_file");
		return;
	}

	if ((input=fopen(argv[1], "r")) == NULL)
	{
		puts ("Unable to open input file");
		return;
	}
	
	if ((output=fopen(argv[2], "w")) == NULL)
	{
		puts ("Unable to open output file");
		return;
	}

	while (fgets(string, MAXSTRINGLENGTH, input))
	{
		itoa(lineNumber++, lineNumberString, 10);
		fputs(lineNumberString, output);
		fputc(':', output);
		fputc(' ', output);
		fputs(string, output);
	}
}